P R E F A C E T O T H E S E C O N D E D I T I O N
T H I S edition differs from the first edition chiefly in C h a p t e r 11, which has been almost completely rewritten to give a more physically-based picture of t h e effects arising from t h e l o n g - r a n g e c o h e r e n c e of t h e electron-waves in superconductors and the operation of q u a n t u m inter- ference devices. W e are very grateful to Dr. J. Lowell for reading and commenting on the draft of this rewritten chapter. T h e r e are a number of other relatively minor changes throughout the book which we hope will improve the presentation.
W e must also t h a n k D r Lucjan Sniadower for pointing out a number of errors, Miss D o r o t h y D e n t o n for typing the manuscript of this second edition, and Nicholas Rose-Innes for help in checking the manuscript and proofs.
Uç iversity ofManchester Å. Ç . R.
Institute of Science and Technology A . C . R. -I.
December 1976
N O T E O N T H E R E V I S E D S E C O N D E D I T I O N IN this revised second edition we have made some further modifications to the text and added a short extra chapter dealing with 'high-tempera- ture' superconductors. A vast a m o u n t of research has been carried out on these since their discovery in 1986 but the results, both theoretical and experimental, have often been contradictory, and seven years later there remains little understanding of their behaviour. W e have therefore been very selective and have included only material which we are confident will have permanent validity.
W e are grateful to D r Geoffrey Ross for c o m m e n t s on the draft of Chapter 14.
E . H . R .
May 1993 A . C . R . - I . ix